Podguy

And like the factory bearings are so good to start with??

Sourcing out the throw out bearing I found the stock one is rated at a maximum of 5800 RPM. That is certainly pushing things to the limit. Replacement bearings can be had for very little money and are rated at 10,000 RPMs. Which would you rather have - a Porsche bearing for $300 or a replacement that go two for $20 and are rated at almost twice the speed.

Given the length of life of the Porsche throw out bearing I think I will go for the replacements. Look in other applications other than the 928, bearings often last the life of the product. So why are we so addicted to maintaining what has proved to be a rotten standard at best. Upgrading is the only path.

As far as the work to get a torque tube out it is only about an hour on automatic cars and the transmission and suspension remain in the car. It took about two hours to replace the bearings in the first one I did. I am sure the others will go much quicker. So on balance you are looking at an afternoon to replace the torque tube bearings. It took me longer to make the windshield washers work. With the money I saved on the rebuild I paided for the Harbor Fright porta power and had change left over in my pocket. This job is just not the trama it is made out to be.

While I had the torque tube out I removed the front cover on the transmission and replaced the two torque converter bearing and the transmission seal. The bearings are the same as the throw out bearings. About $20 for the pair. I picked up the seal for under $5. Probably a good idea to replace the rear main engine seal as well. Done right you are good to go for another 20 years.

Now I wonder how the torque tube will hold up with cermeric bearings?

Dan the Pod Guy

RyanPerrella

Dan,

can you PM me the number for a GT throw out bearing? Or post it if you like. I have my clutch out and will replace it if i can source it for $20 as opposed to the $150-$200 porsche charges

Thanks in Advance

Peter F

Ryan,

this is the 6008 bearing Dan posted about in post #1.

/Peter

Rehan

Is this the correct bearing?

http://www.skatebearings.com/6008-2RS-6008-ZZ.htm

Podguy

I have not pressed apart a later bearing - only the early cars 78-86 with the dual clutch. I have a couple of newer clutch cores and if I get a chance and it warms up and stops raining I will go out and break one down. I need to do it for the conversion any way.

It is interesting the 6008 is used in both the throw out bearing and the two bearing in the torque converter cover. No magic with a 6008 bearing.

Any one have experience with Eppe

Podguy

Sorry pushed the wrong key.

The question was does anyone have any experience with the EPE rebuilt clutch covers for the early cars?

Thanks

Dan

Peter F

I have and it does not look like a STD bearing on the newer versions.





/Peter

LT Texan

Where are these insert available from? Just Jager?

I mean $40.95 a piece.

Imo000

I can remember the bearing # but the bearings in the windshield wiper motor are standard size too. I’ve replaced them in my first 928 about 10 years ago and they were $5 each.
I’ve noticed that as much as possible, Porsche used off the shelf standard bearings in the 928. This goes for some of the older BMWs too.

jpitman2

Anybody would be nuts not to use off the shelf stuff where possible. I see in small stuff mixtures of Imp and metric bearings in units, because each is made in huge volumes and therefore cheap (eg .75" OD x .375" ID with a 32mm OD x 14mm ID) - seems nobody feels the need to make a metric equivalent of the small one.
Dont forget that the amount of time a throwout bearing spends at high revs is VERY short indeed, even in a vigorously driven car, in terms of bearing life.
jp 83 Euro S AT 51k.

Imo000

That's probalby why Porsche decided to use a bearing with an prm limit less than the rev limiter.

Imo000

This makes me wonder what quality are the original factory bearings, the one that the factory originally installed. Are they the premium or the “economy” line? I don’t think they are premium.

Podguy

My experience with INA bearings has not been much better than my experience with German rubber.

Mercedes pulled a nice trick on one bearing I was looking for. It was an INA bearing, but Mercedes pulled a patent on it. Thus since it was specially made for Mercedes and they held the patent there were no third party suppliers. The bearing could still be soruced from INA, but they required a minimum purchase of five. The total cost of five bearings was more than the smog pulley with the embedded bearing.

Nasty - there should be some laws against these types of monopolyistic practices.

As far as the newer throw out bearing I pressed one apart too. There are no numbers on the bearing, but it is interesting to note the bearing is packed with grease. Unless the bearing is fried it should respond well to cleaning and repacking. After all that is what we do with front wheel bearings.

Ouch clutch parts are expensive. I purchased a over stock early pressure plate for $100 only to later find a rebuilt for $25. All other manufacters have their clutches rebuilt by third parties why are we stuck paying a fortune for clutch parts.

Dan the Pod Guy

Peter F

I did that with the one on my pictures and it seems nice and smooth now.
It could probably serve well for many more Years as long as the plastic inner lining of the part it goes on to is undamaged.
(The donor part this bearing came from does not look good on the inside)

/Peter

Hilton

Hmm.. the plastic liner was a late addition for the GTS.

My '89's original clutch had no plastic liner on the tube and bearing, so re-packing it would probably have saved buying a new release arm, guide tube and bearing set.

I think the plastic/teflon lined parts were added for the GTS? Anyone with an earlier clutch might still be able to get away without spending the extra $400 for those 3 parts, and just get the clutch plates. Assuming the plates will work with the earlier bearing?